Cloze

Directions: In this part, there is a passage with ten blanks. For each blank there are four choices marked A, B, C, and D. Choose the best answer for each blank.

     Cloud computing (云计算) means storing and accessing data programs over the Internet instead of your computer's hard drive. It  computing over a network, where a program or application may run on many connected computers at the same time.
     For some, cloud computing is metaphor (隐喻) for the Internet. It  uses connected hardware machines called servers. Individual users can use the server's processing power to run an application, store data, or  any other computing task.
     For businesses, cloud computing is an ideal way to reduce . For example, companies may buy services in the cloud. That is to say, instead of  applications on every single computer in the company, cloud computing would allow workers to log into Web-based service (a could) which hosts all the  individual users would need for their job.
     While cloud computing could change the entire computer industry, there are still some  about the security of the data stored on the remote machines. It is true that it promises to save a lot of work. However, this technology  a fundamental question. Is it safe to store one's data on someone else's computer? The cloud service provider needs to establish relevant policies that describe  the data of each cloud user will be accessed and used. Cloud service users should also be able to encrypt (加密)  that is processed or stored within the cloud to prevent unauthorized access.